Typographical element or matrix



Nov. 1, 1949 H. R. FREUND TYPOGRAPHICAL ELEMENT OR MATRIX Filed July 2 1 INVENTOR HERMAN R. FREUND ATTORNEY Patented Nov. 1, 1949 UNITED STATES PATENT OFFICE TYPOGRAPHICAL ELEMENT OR MATRIX Herman R. Freund, Brooklyn, N. Y., assignor to Intertype Corporation, Brooklyn, N. Y., a corporation of New York This invention relates to character-bearing elements, commonly called matrices, for use in the photographic production of type matter, and more particularly to elements or matrices of a class such as is disclosed in United States Patent 2,277,825, granted March 31, 1942.

Among the objects of the present invention are the following: To provide an improved element which may be readily cleaned; an element in which the portion bearing the photographable character is foolproof against damage and deterioration by being fully protected from atmospheric conditions, from physical contact and from cleaning fluids, and to provide an element which by virtue of these and other features is economical to construct and to maintain.

Another object is to provide a novel method for manufacturing such a matrix.

Other objects will be in part obvious and in part pointed out hereinafter.

In the accompanying drawings:

Figure 1 is an exploded vertical section taken on the line 3-3 of Figure 3, showing a character plaque and covering shields therefor embodying the invention, removed from their positions relative to a single shoulder form of recess in the matrix body;

Figure 2 is a true vertical section taken on the line 3-3 of Figure 3;

Figure 3 is a front elevation of a matrix provided with transparent shields over the character plaque.

Figure 4 is a fragmentary view of a portion of the matrix in Figure 3 with the character plaque and shields removed to show the outlines of the single shoulder recess in Figure 1 for supporting the plaque and shields;

Figure 5 is a bottom end view of the matrix shown in Figure 3;

Figure 6 is a fragmentary view similar to Figure 4 showing the front shield secured against displacement from the form of recess shown in Figure 4 by a staking operation;

Figure 7 is an exploded and enlarged fragmentary vertical section of the body portion of a matrix provided with an opening having a double shouldered recess for supporting the plaque and its shields at opposite sides against displacement;

Figure 8 is similar to Figure 7 but shows the plaque and the shields at its opposite sides in place in the double shouldered recess;

Figure 9 is a fragmentary sectional elevation showing a suitable form of punch for cutting and driving the character-bearing plaque from a continuous strip of developed film downwards into the shouldered recess or opening in the matrix body, the latter forming the die for receiving the plaque when the punch is operated;

Figure 10 is similar to Figure 9 but shows the punch in operated position after cutting and driving one of the shields from a strip of transparent material downward into place over one side of the character-bearing plaque;

Figure 11 is a reduced fragmentary plan view in section taken on the line I l-Il of Figure 9 showing the die locating finger as arranged on the die bed;

Figure 12 is an enlarged fragmentary section of a matrix the front shield of which is sealed 'by use of an oversize punch;

Figure 13 is an exploded fragmentary sectional view of the matrix in Figure 1, wherein the front shield comprises a film base material laminated to the character plaque before insertion into the 'matrix.

Figure 14 shows a form of tool which may be employed for pressing and sealing the shields in :a recess of the form shown in Figure 4.

Figure 15 which is generally similar to Figure '12 shows, in exaggeration, the concave set which the shields retain after being pressed into place.

Referring to Figure 3, the character-bearing element or matrix comprises a metal body I which except for its character has the general configuration and characteristics of the well well known form of circulating matrix employed in typographical composing and line casting machines, namely, upper and lower pairs of lugs 2 and 3 respectively which support and guide the matrices during line composition and circulation through various portions of the machines, and combination teeth 4 for their selective distribution to the usual channeled magazines in which the matrices are stored in the machine. The thickness of the matrix body is its over-all dimension edgewise as viewed in Figure 2 and this dimension varies with the setwise width of the particular character borne by the matrix, thus to provide for spacing the individual characters of a line variably relative to one another in accordance with their variant setwise widths, as usual in printed matter.

For photographic purposes, the matrix as herein shown carries its character on a plaque such as a piece of film negative 5 disposed in a plane parallel to the flat or broad side faces of the matrix body and supported between said faces on a shoulder 6 of a recess or window formed in the body- The efiective edgewise thickness of the different matrices in a font thereof is defined by the projected distance outwardly of a pair of vertical ribs I from the rear face of each matrix, the character-bearin web portion i of the matrix body between such ribs being made only as thick as need be for strength, minimum weight and mechanical accommodation of the character plaque. Thus, for the different and varying width characters, the over-all edgewise thickness of the matrices will run from a minimum thickness (always slightly more than that of the web portion I) for the narrowest character to a maximum thickness, defined by relatively thick ribs 1, for the wider characters. All matrices have at least a very shallow rib l on their rear face and a corresponding shallow rib l (of constant thickness in all cases) on their front face so that the opposite surfaces of the web portions I of adjacent matrices when assembled edgewise in a line will never contact, the sole contactin surfaces being the outer faces of the projecting ribs.

The web portion of the matrix body is provided with a transverse recess which extends clear through the web of the body and may, for example, be constituted by a window 8 and a larger concentric recess portion 9 extending partially into the body from the front fiat side thereof, thus to form the plaque supporting shoulder 6. The enlarged portion 9 of the recess extends into the matrix body the same distance for all matrices of a font thereof so that when the front face of any matrix (actually the flat outer surfaces of the shallow ribs 1 is placed against a stationary abutment for photographing, the character will always be disposed the same distance from the sensitized surface regardless of the different body thicknesses as defined by the ribs 1.

The window 8 may be formed by drilling through the web of the matrix body on centers such that the holes produced overlap as best seen in Figure 4, and the shoulder 6 is then formed by leading a counterbore into the body from its front side on the same centers and to a constant depth in all cases. In order that the shouldered recess thus formed may be located accurately and alike in all matricesan essential requirement for attaining perfect horizontal alignment of the successively photographed characters in the photographically reproduced line-the V-shaped character aligning notch I is used to position the matrix in such holding fixture as may be employed during the recess forming operations. As pointed out in my Patent No. 2,277,825, the vertex of the notch I0 is a gauge point on the matrix which is directly related to the location of the characters on their plaques, all characters being located with respect to horizontal and vertical reference or foundation lines, the vertical line being calculated to lie a given distance in from the vertex of the notch 10 and the horizontal line lying a given distance below said vertex.

Accordingly, by using the notch It to position the matrices while forming the recesses therein, all recesses will be located alike, and by again using this notch for locating purposes when the plaques are punched out and inserted, in the manner hereinafter set forth, the foregoing prearranged character alignment will be preserved.

The plaque herein shown bears the capital letter E and this plaque as W811 as similar ones bearing the different characters of a font may be punched from a strip of negative film de- 4 veloped and fixed after photographically impressing the characters thereon at suitably spaced intervals. The individual plaques conform in size and shape to the outlines of the recess 9 so that when inserted in such recess they will have no lateral play.

Referring to Figures 9, 10 and 11, the reciprocably mounted element locating finger 20, Figure 11 is operated in conjunction with the punch 2| to positively hold and align the element endwise and also laterally against an upstanding rail 22 fixed to the bed plate 22 before the punch contacts the film 23 from which the character bearing plaque is punched. The film strip 23 may be guided over the element (actually the die) on the bed plate in one or another obvious manner, and may be fed step-by-step as by sprockets, not shown, engaging edge perforations 123 and turned in timed relation with the strokes of the punch. With unperforated strip suitable friction feed rollers would of course sufiicc. Pins 24 are carried by the punch holder and enter aligning holes 25 which are pierced in the film strip, at opposite sides of the characters, at the time the successive, characters are exposed on the undeveloped strip. By now using these same holes 25 and pins 24 for aligning purposes during the punching operation the required perfect accuracy of location of the character on the punched out piece of film-the plaque properwith the aligning notch It now cooperating with finger 20 is assured.

As previously stated the element itself forms the die for the punch. The stroke of the punch may be regulated so as to drive the plaque downward firmly against the shoulder 6 as shown in Figures 1 and 2, which shoulder positions the plaque in proper parallel and spaced relationship to the front face of the body portion l Although means have been devised for conveniently and satisfactorily holding the plaque in a shouldered recess, leaving the plaque exposed on either side, such arrangement has left the exposed plaque susceptible to damage and the elements have been difficult to clean. The plaque proper is thin and easily scratched as well as susceptible to staining from finger marks, as well known with photographic film, and such scratching or staining, if reproduced in the photographic operation as they may well be, would of course be very objectionable. Also, the exposed plaque is subject to attack by acid or solvent cleaners, and dirt and dust may collect in any recess or pocket existent around the plaque.

Because of the commercial importance of providing in the environment of photographic type composition a durable and otherwise successful element of this general nature, various attempts have been made to preserve and protect the plaque and to make the whole element readily cleanable, foolproof and economical to construct and maintain. But it was not until the present invention that a complete and successful solution of these problems was obtained, and extensive, trials have demonstrated the practicality and utility of the provisions herein disclosed.

Thus it has been .found that the necessary absolute preservation and protection of the plaque is obtained by sealing it from the atmosphere and from all other external influences and that such sealing can be accomplished effectively and economically by cover members made of a yieldable rather than a hard and rigid material, a material which is wholly suitable from an optical standpoint, and a material which is transparent so that characters of all shapes in their relative locations for printing alignment may be accommodated in thenecessarily restricted area of the element body that can be made available for the plaque. Further, by making the outer surface of such cover members flush or substantially so with the adjacent faces of the web portion of the element body, dust and dirt collecting pockets are eliminated. And by making these cover members of a material that is inert to the usual cleaning fluids used to clean the matrices and to staining from finger marks, and which if scratched or fingered may be buffed to remove the scratches or marks left thereon merely by the smoothing off or actual flowing of the material itself, perfect reproductive results may be attained with great economy over prolonged periods of use.

According to the present invention the plaque 5 is firmly held in place and entirely covered over its front and rear sides by shields II and I2 respectively made of a suitable transparent plastic material such as commercial Plexiglas, Lucite or Vinylite, all of which are thermoplastic acrylic resins, or ordinary cellulose acetate film may he used, if desired. The commercial materials alluded to are in the first place flexible. Moreover, they are crystal clear, have a light transmission ratio equal to that of the finest optical glass, and are not affected by oil or water, or by acids or alkalis except in highly concentrated form. Such materials do not discolor with age, may be readil buffed or otherwise treated to remove scratches, and by being made flush with the body of the element they may be kept clean by a brush or soft wiper suitably disposed, for example, in the path of circulation of the elements through the machine.

Shields of such materials ma be punched from sheet stock of the required thickness by a punch such as 2i (Figures 9 and and by using the recessed element itself as the die. The shield is sheared to the exact size of the recess, thus providing the required nice fit for securely holding it in place and sealing the openings at each side. The effectiveness of the security and sealing resulting from the application of flexible covering material in this direct manner, using the element itself as the die, will be further discussed hereinafter.

The character-bearing plaque when protected in this manner through complete sealing has proven unaffected by the usual cleaning operations with liquid solvents.

In addition to the nice fit which holds the cover members in place and seals the plaque from atmosphere and penetration of fluids, the web portion I may be staked at intervals as shown in Figure 6, to move portions of the material forming the side walls of the openings 6 and 8 very slightly into the cover members, to mechanically clinch the cover members as indicated by the exaggerated indentation I3 These indentations, however, are so slight as not to substantially disturb or alter the desired smoothness and continuity of the side faces of the element body and outer surfaces of the cover members.

It has been found that in making up fonts of the character-bearing elements it is practical to use three different thicknesses for the web portions l Thus, characters having relatively narrow setwise widths can be mounted on character-bearing elements having a web portion .030 in. thick. Characters having medium setwise widths can be mounted on character-bearing elements having web portions .040 in. thick. And the characters having relatively wide setwise widths can be mounted on character-bearing elements having web portions .050 in. thick. Also it has been found practical to use characterbearing plaques .005 in. thick for all matrices.

Further, it has been found practical to use cover members .010 in. thick with web portions .030 in. thick; cover members .015 in. thick with web portions that are .040 in. thick; and cover members .020 in. thick with web portions that are .050 in. thick. Thus with the cover members in contact with the entire areas of the faces of the plaque as shown in Figure 1, the cover members lie substantially flush with the surfaces of the web portionthe difference of .005 in. in thickness being distributed between the two cover members. In other words, the cover members are no more than .0025 in. depressed from the faces of the web portions.

Such character-bearing elements as above described and disclosed in the drawings have the advantages that the cover members are flush with the web portions so that there are no pockets to collect dirt. Also the cover members seal the plaque against dirt, the atmosphere and finger marks, and hold the plaque firmly in place without distorting the character carried by the plaque. The fact that the cover members are in contact with both sides of the plaque has the advantage of holding against movement any microscopic foreign particles which might unavoidably be sealed between the plaque and the cover members 'so that such foreign particles are not free to shift about and collect at one point,

nor are they free to rub or grind between the plaque and cover members, as the matrices are circulated through the photo-composing machine.

As shown in the drawings, the plaque and opening are made as small as practical with respect to the dimensions of the character borne by the plaque. This expedient assures desired mounting stability of the cover members and plaque within the opening.

Turning now to the greatly magnified showings in Figures 7 and 8, a further improvement is shown by which the plaque 5 and its cover members are even more surely held in place in an opening 28 through the web portion l of the element body, especially against displacement by pressure, and are as accurately aligned. To 10- cate and hold the plaque in alignment flatwise a protuberance 28 is found on the wall of the opening 28 in such manner as to provide double shoulders spaced as required from each of the side faces 26 and 21. Further, the protuberance need be only of the order of a few thousandths thick and need extend into the opening 28 only a few thousandths. The plaque 5 as shown in Figure 8 rests on the shoulder facing the front side face 26 and is held tight against it by the adjacent cover member 29. The other cover member 30 rests against the shoulder at the opposite side and may be separated from the plaque only by the thickness of the shoulder.

The shouldered protuberance 28 serves positively to hold the cover members and the plaque against being pushed out of the opening 28 from either side, and yet because of the small thickness of the protuberance the over-all thickness of the web portion l of the body for accommodating the thickness of the plaque and also cover members of adequate thickness need not be increased over that of the single shoulder arrange-' ment.

Such double shouldered protuberance may be formed by running into the opening 28 from either side, and preferably simultaneously, punches slightly larger in cross-section than the opening 28, whereby the respective punches actually shave the side wall of the opening to their own size, the shaved material, still attached to the wall around the opening, being compacted by and between the approaching punches to form the protuberance and flat shoulders at either side. Side walls formed of readily machinable metal such as brass adapt themselves admirably to such a shoulder forming operation.

When using the embodiment shown in Figures 7 and 8, care is taken to exclude foreign material, even though of microscopic size, from the space formed by the shoulder 28 1. e., the space between the plaque and cover member which rests against the opposite side of the shoulder 28*.

As hereinbefore pointed out, the method of applying the flexible shields or cover members by using the element directly as the die for the punching operation is highly effective in securing such fine fitting of the covers as to assure the desired sealing action directly, that is, without taking further measures to perfect the seal. What happens is that when the punch strikes the flexible material of the covers, which material is unsupported over the area thereof which overlies the die opening, the material sags slightly while being sheared by the die and is thus actually cut to a slightly larger size than the opening. This is clearly evidenced by the slight concavity which the cover members exhibit and retain after being pressed into place by the punch, see Figure 15. This gives rise to the further important advantage that pressure exerted inward- 1y on one of the covers, tending to push it and the opposing cover and plaque out of the opening, is resisted not only by the small shoulder but also by the expanding perimeter of the opposing cover caused by attempting to reduce its concavity.

Referring to Figure 9, there is illustrated another valuable feature of the method. A strip of cover material 3i overlies the film strip 23 carrying the characters. By thus overlying the film, a single punching operation cuts first the plaque and then the cover member and pushes both to their proper position against the front shoulder in the opening. If desired, the plaque and both covers may be pressed into place at the same time, simply by employing opposing punches with the element suitably held between them.

An additional method of sealing the cover members in place and which may be used with either the double or single shoulder construction is shown in Figures 12 and 13. This method utilizes plasticity of the cover members when heated to temperatures in the order of 300 F.

The class of cover materials hereinbefore mentioned become fiowable under moderate pressure and elevated temperature. Referring to Figures 12, 13 and 2, a sealing tool l conventionally heated is pressed against the cover member or shield l l while the matrix is held on a solid bed. The plastic material contacted by the bead [B of tool 15 quickly yields and flows into bonding relation with the side walls of the recess whereby to assure hermetic sealing of the opening.

It will be understood that a tool similar to the tool 15 would be employed in the same manner for sealing in the transparent rear shield 12 and thatthis shield may also be mechanically staked in place if desired.

In Figure 12 the front shield II and the char acter bearing plaque 5 are shown as a laminated unit designated [4. Units of this kind may be formed by punching them from a strip of developed film on which a succession of characters have been photographed, such strip then being cemented to material such as clear cellulose acetate film of the proper thickness by any well known method of forming such laminae. The laminated unit I4 may be staked in place in the recess 9 and then hot-pressed by the tool IE to seal it to the walls of the recess, and the rear shield 52 may be similarly sealed in its recess, all in the manner hereinabove outlined. In this instance the piece of clear cellulose acetate film material II overlying the plaque 5 and integral with the latter forms the transparent front shield for sealing the recess 9 and protecting the plaque from the front while the transparent shield 12 seals the rear recess or opening 8 to protect the rear side of the plaque.

Thorough tests of matrices embodying the construction above described and without the mechanical stakin or hot-pressing operations have shown the sealing of the cover members to be satisfactory, the latter operations being auxiliary and useful according to specific conditions and material. It is contemplated, however, that the seal may be augmented, if desired, by the application to the edges of the shields or to the walls of the recesses of a suitable known cement (a commercial acrylic resin solvent in the case of Plexiglas or a known gelatin base glue or adhesive in the case of cellulose acetate film).

Another step which may be employed in the operation of inserting the cover members is illustrated in Figure 15. Here the material of the element body around the perimeter of the opening is furled slightly over the edges of the pressedin covers. This is accomplished by using a punch like the punch 2| but formed just ashade larger in cross section than the opening in the element body, and by allowing such punch in its downward stroke to partake of a slight overrnotion, thus to lightly peen the surface of the element body material all the way around the rim of the opening so that a slight fin of the material flows inwardly over and is crowded into intimate engagement with the edges of the covers adjacent to their outer surfaces. It will be observed that such surface peening does not break into or substantially alter the relative continuity or smoothness of the side faces and outer surfaces of the covers.

While the use of the element itself as the die for punching the plaque and cover members, alone or together, is herein prescribed as preferable (for reasons of economy, convenience and simplicity in obtaining the desired fine fitting of the parts) such procedure is not essential within the spirit of the invention. Obviously the plaque and/or cover members may be punched out in a separate die and thereafter placed in the opening formed in the element body. And the cover members in such case may also be made slightly over-size so as to provide the desired nice fit and binding engagement with the wall of the opening, thus to hold firmly against displacement and to seal the opening.

This application is a continuation in part of my pending application Serial No. 566,278 filed December 2, 1944, now abandoned.

I claim:

1. A character-bearing element for use in a keyboard-operated composing and photographing machine for producing type matter, said element comprising a unitary rigid body portion having two opposing side faces and having an opening connecting said side faces and extending through said body portion, a protuberance on the inner wall surface of said opening and located between the faces and having a thickness substantially less than the distance between said faces, a character-bearing plaque mounted in said opening against said protuberance, a transparent cover member so mounted in said opening on each side of said plaque as to lie wholly between the planes of said faces and completely tocover said plaque, the edges of said cover members engaging the side walls of said opening in a, nice fit to seal said plaque from external physical contacts, the outer surfaces of each cover member adjacent the margin of the opening being substantially flush with the adjacent face of the said body portion to facilitate cleansing of said body portion and cover members, one of said cover members being positioned against said protuberance and the other against said plaque to hold said plaque in place against said protuberance, and an air space between at least one of said cover members and said plaque.

2. A character-bearing element for use in a keyboard-operated composing and photographing machine for producing type matter, said element comprising a unitary body portion having front and rear faces and having an opening connecting said faces and extending through said body portion for the passage of light, a protuberance on the inner wall surface of said opening located between the faces and having a thickness less than the distance between said faces, a plaque bearing a type character photographable by transmission of light through the opening and mounted therein against said protuberance and spaced from the front face of the element, two transparent cover members respectively mounted in said opening and completely covering the plaque at its opposite sides, said cover members being formed slightly larger than the said opening and of such thickness that at least their outer surface portions adjacent the margin of the opening lie substantially flush with the respective adjacent faces of the element when their corresponding inner surface portions are in contact respectively with the plaque and with the protuberance which is spaced from the rear face of the element, the edges of said cover members bindingly engaging the wall of the opening to hold the plaque therein and seal the latter from external influences, and said members, in response to said binding engagement, being sprung concave inwardly relative to the side faces of the element to the extent permitted by the thickness of said protuberance on the wall of the opening, whereby pressure on either cover member tending to force it outwardly from the opening tightens the binding engagement between the side walls thereof and the edge of said cover member.

3. A character-bearing element for use in a keyboard-operated composing and photographing machine for producing type matter, said element comprising a unitary rigid body portion having two opposing side faces and having an opening connecting said side faces and extending through said body portion, a protuberance on the inner wall surface of said opening and located between the faces, a character-bearing plaque mounted in said opening against said protuberance, two transparent cover members respectively so mounted in said opening on each Side of said plaque as to lie wholly between the planes of said faces and completely to cover said plaque, the edges of said cover members engaging the side walls of said opening in a nice fit to seal said plaque from external physical contacts, the outer surfaces of each cover member' adjacent the opening being substantially flush with the adjacent face of the said body portion to facilitate cleansing of said body portion and cover members, one of said cover members being positioned against said protuberance and the other against said plaque to hold said plaque in place against said protuberance, and at least one of said cover members being sprung slightly concave outwardly and convex inwardly wh'ereby pressure on said cover member tending to force it outwardly from the opening tightens the contact between the side wall thereof and the edge of said cover memher.

4. A character-bearing element for use in a line-composing machine equipped for the photographic production of lines of type matter, comprising an opaque unitary relatively thin body portion having parallel opposed outer side faces and having an opening connecting the side faces, a character-bearing plaque in the opening of the same shape as the opening and formed to such size that when pressed thereinto its peripheral edge tightly engages the wall of the opening, the plaque bearing a type character photographable by transmission of light through the opening, an impervious transparent cover member in the opening of the same shape as the opening and formed to such size that when pressed into the opening the cover member makes contact with the entire area of one side of the plaque and its peripheral edge tightly engages the wall of the opening, a second impervious transparent cover member in the opening on the other side of the plaque of the same shape as the opening and formed to such size that when pressed into the opening the second cover member makes contact with the entire area of the other side of the plaque and its peripheral edge tightly engages the wall of the opening, these two transparent cover members having such thicknesses that when so positioned each lies whooly between the planes of the two side faces of the body portion and the marginal surfaces of the cover members are substantially flush with the contiguous surfaces of the corresponding side faces, whereby the cover members, though not attached to the plaque, serve to hold the plaque flatwise in place, to seal it from external physical contacts, and to facilitate cleaning of the entire outside surfaces of the cover members.

5, A character-bearing element such as described in claim 4 further characterized by the feature that the surface portion of the material of the element body portion adjacent to the wall of the opening at each face of the body is smoothly furled slightly over the edges of the cover members engaging said wall.

6. A character-bearing element such as described in claim 4 further characterized by the feature that at least a portion of the surface of each of the side faces of the element body portion adjacent the edges of the opening is slightly depressed and the corresponding wall portions of said opening are slightly distorted inwardly against the edges of the cover members, the ex- REFERENCES CITED The following references are of record in the file of this patent:

Number 12 UNITED STATES PATENTS Name Date Curtis Dec. 6, 1938 Swanstrom Oct. 15, 1940 Burnanelli Oct. 7, 1941 Freund Mar. 31, 1942 Litty Dec. 14, 1943 Taylor Aug. 14, 1945 Beishline Aug. 28, 1945 Certificate of Correction November 1,1949

Patent No. 2,486,834

ered patent requiring It correction as follows:

The drawing, Sheet 2, containing Figures 7 to 12, inclusive, as shown below, should be inserted as part of the Letters Patentitem. 1. I 949 H. R. FREUND TYPOGRAPHICAL ELEMENT 0R MATRIX ease 2 Sheets-Sheet 2 Filed July 20, 1945 TOR MAM-P. meow) in the heading to the present sheet of drawing, line 3, to the right of the filing date, insert 2 SheetsSheet 1;

. with these corrections therein that y conform to the record of the case 1n the Patent Office.

and that the said Letters Patent should be read the same Ina Signed and sealed this 28th day of February, A. D. 1950.

THOMAS F. MURPHY,

Assistant Gammz'ssz'oner of Patents.

Certificate of Correction November 1,1949

Patent No. 2,486,834

ppeer in the above numbered patent requiring The drawing, Sheet 2, containing Figures 7 to 12, inclnsive, as shown below, should be inserted as part of the Letters Patent Nov. 1, 1949 H. R. FREUND ryroenmilcm. ELByENT OR m'nux 2 Sheets-Sheet 2 Filed July 20. 1945 in the heading to the present sheet of drawing, line 3, to the right of the filing date, insert 2 SheetsSheet 1 and that the said Letters Patent should be read with these correetio the same may conform to the record of the case 111 the Patent Office.

ns therein that Signed and sealed this 28th day of February, A. D. 1950.

THOMAS F. MURPHY,

Assistant ommz'ssz'oner of Patents. 

